CVE-2026-44829
Gotenberg has path traversal in zip entry name via Windows-style separators in upload filename
Impact
Gotenberg is a Docker-powered stateless API for PDF files. In 8.32.0 and earlier, filename handling in pkg/modules/api/context.go uses filepath.Base on Linux, which does not treat backslashes as path separators, so a multipart filename containing Windows-style parent directory components survives sanitization. The original filename flows through ctx.diskToOriginal and the multi-output PDF routes into archives.FilesFromDisk and archives.Zip.Archive as the generated zip entry name. A remote attacker can submit a name such as ........\Windows\System32\evil.pdf through an upload or an upstream downloadFrom Content-Disposition header, and a Windows archive extractor can write the resulting file outside the intended extraction directory. The affected paths include /forms/pdfengines/split and other multi-output PDF, LibreOffice, and conversion routes, and exploitation can cause arbitrary file writes on a downstream Windows system when a user or process extracts the returned archive. This issue is fixed in version 8.33.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/gotenberg/gotenberg/v8 | <= 8.32.0 | 8.33.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hwc4-gmrw-5222
- https://github.com/gotenberg/gotenberg/security/advisories/GHSA-hwc4-gmrw-5222
- https://github.com/gotenberg/gotenberg/releases/tag/v8.33.0
- https://github.com/gotenberg/gotenberg/commit/93d0103585372433e18b351bb16edf4c383932d3
- https://github.com/gotenberg/gotenberg/issues/662